6.1.2 Old-style variable initialization

GNU Fortran allows old-style initialization of variables of the
form:

INTEGER i/1/,j/2/
REAL x(2,2) /3*0.,1./

The syntax for the initializers is as for the DATA statement, but
unlike in a DATA statement, an initializer only applies to the
variable immediately preceding the initialization. In other words,
something like INTEGER I,J/2,3/ is not valid. This style of
initialization is only allowed in declarations without double colons
(::); the double colons were introduced in Fortran 90, which also
introduced a standard syntax for initializing variables in type
declarations.

Examples of standard-conforming code equivalent to the above example
are: